EP0506443B1 - Amplificateur de puissance dans une automobile pour connexion enfichable avec un téléphone mobile - Google Patents

Amplificateur de puissance dans une automobile pour connexion enfichable avec un téléphone mobile Download PDF

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Publication number
EP0506443B1
EP0506443B1 EP92302689A EP92302689A EP0506443B1 EP 0506443 B1 EP0506443 B1 EP 0506443B1 EP 92302689 A EP92302689 A EP 92302689A EP 92302689 A EP92302689 A EP 92302689A EP 0506443 B1 EP0506443 B1 EP 0506443B1
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EP
European Patent Office
Prior art keywords
signal
terminal
received
portable unit
unit
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP92302689A
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German (de)
English (en)
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EP0506443A3 (en
EP0506443A2 (fr
Inventor
Naoki Hirasawa
Shinichi Kobayashi
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NEC Corp
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NEC Corp
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Publication of EP0506443A2 publication Critical patent/EP0506443A2/fr
Publication of EP0506443A3 publication Critical patent/EP0506443A3/en
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Publication of EP0506443B1 publication Critical patent/EP0506443B1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/3877—Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters

Definitions

  • the present invention relates to a car-mounted booster for plug-in connection with a mobile telephone set, or portable unit as referred to hereinafter, included in a cellular car telephone system. More particularly, the present invention is concerned with such a booster which reduces the loss of high frequency signals due to the connection with the portable unit.
  • a car telephone of the type described is selectively operable in a portable mode in which a portable unit is removed from a booster or in a car-mounted mode in which it is plugged in the booster.
  • the portable mode the portable unit holds communication by using a built-in telephone antenna.
  • the car-mounted mode the portable unit is plugged in a car-mounted apparatus made up of a connection unit to which the unit is removably connected, a curled cord connected to the connection unit by a coaxial cable beforehand, a power amplifier unit connected to the curled cord and fixed in place in, for example, a luggage compartment, and a car antenna connected to the power amplifier unit.
  • a connection unit to which the unit is removably connected
  • a curled cord connected to the connection unit by a coaxial cable beforehand
  • a power amplifier unit connected to the curled cord and fixed in place in, for example, a luggage compartment
  • a car antenna connected to the power amplifier unit.
  • the portable unit modulates a carrier signal generated by a first frequency synthesizer by a communication signal and other signals to thereby produce a first transmit signal to be transmitted.
  • the telephone antenna converts the first transmit signal to a radio frequency (RF) signal and then sends it to a base station. Also, the telephone antenna converts an RF signal sent from the base station to a first received signal, and a receiving amplifier amplifies the first received signal.
  • a first receiving mixer is included in the portable unit and generates a first intermediate frequency (IF) signal in response to the amplified first received signal and a first local oscillation signal generated by a second frequency synthesizer.
  • a demodulator produces a demodulated signal including a communication signal and other signals from the first IF signal.
  • the power amplifier unit When the user connects the portable unit to the connection unit and then turns on booster ON means incorporated in the connection unit, the power amplifier unit is activated to set up the car-mounted mode. Then, the user is capable of holding a conversation with a remote base station on the telephone. Specifically, as an RF signal sent from the base station comes in through the car antenna, the power amplifier unit effects low noise amplification with a weak second received signal based on the RF signal by a preamplifier and feeds the amplified second received signal to the portable unit. On receiving a first transmit signal from the portable unit, the power amplifier unit amplifies or boosts it by a power amplifier and feeds the resulting second transmit signal to the car antenna.
  • the power amplifier unit serves to increase the communicable distance between the car telephone and the base station.
  • the power amplifier unit includes two duplexers, i.e., one on the car antenna side for separating the second transmit signal and the second received signal and the other on the portable unit side for separating the first transmit signal and the second received signal undergone low noise amplification.
  • the RF signal applicable to the car telephone system lies in, for example, the 800 MHz band as prescribed by AMPS (Advanced Mobile Telephone System), and the transmit signal and the received signal are different in frequency from each other.
  • the received signal fed from the power amplifier unit to the portable unit has the same frequency as the RF signal sent from the base station.
  • the frequency of the IF signal is often selected to be about 90 MHz. Since the curled cord is about 5 meters long, it has to be small size, light weight and, in addition, flexible.
  • a high frequency signal transmission cable corresponding to a 1.5D-2W (or RG-174/U as prescribed by MIL standards) coaxial cable is used for the propagation of the second received signal.
  • the transmission loss of the received signal over the curled cord amounts to about 4.3 dB. Since the loss of received signal due to a high frequency signal transmission cable is substantially proportional to the square root of frequency, the transmission loss ascribable to the curled cord will be further aggravated if the RF signal of a car telephone system is shifted to the 1.5 GHz band which is now under investigation.
  • the problem with the conventional car telephone is that the total reception noise factor is low since it compensates for the loss of received signals ascribable to the high frequency signal transmission cable of the curled cord and the two duplexers of the power amplifier unit by increasing the amplification gain of the receiving amplifier of the portable unit. Moreover, since the portable unit has no margins as to the voltage to be supplied, power consumption and volume, the circuit arrangement of the receiving amplifier and that of the receiving mixer are limited.
  • the receiving mixer for example, causes intermodulation to occur due to the limited circuit arrangement thereof, degrading the reception characteristic.
  • EP-A1-0486181 is cited under Article 54(3) EPC and was published on 20 May 1992.
  • an object of the present invention to provide a car telephone which reduces the loss of received signals ascribable to the power amplifier unit and the signal loss ascribable to the high frequency signal transmission cable.
  • a car telephone of the present invention like a conventional car telephone, has the telephone antenna, portable unit, car antenna, power amplifier unit, connection unit, and curled cord with a coaxial cable.
  • a second receiving mixer follows the preamplifier for converting the second received signal to a second IF signal of the same frequency as the first IF signal.
  • the second IF signal is fed to the portable unit via a high frequency signal transmission cable included in the curled cord and the connection unit.
  • the portable unit has switch means which replaces the signal from the first receiving mixer with the second IF signal in response to the turn-on of the power amplifier unit and delivers it to the demodulator.
  • a second local oscillation signal to be fed to the second receiving mixer may be implemented as a first local oscillation signal which is fed from a first frequency synthesizer for reception over the coaxial cable of the curled cord.
  • the second local oscillation signal may be fed from a third frequency synthesizer incorporated in the power amplifier unit. Then, it is, of course, necessary to control the local oscillation signal of the second frequency synthesizer by a channel control signal which controls the first frequency synthesizer; the control signal is applied to the power amplifier unit via the connection unit and curled cord.
  • the power amplifier unit does not need the previously stated duplexer on the portable unit side since it does not interchange the first transmit signal and second received signal with the portable unit over the same high frequency transmission cable.
  • a car telephone embodying the present invention includes a portable unit 7 and a telephone antenna 6 connected to an antenna terminal 701 which as included in the portable unit 7.
  • the portable unit 7 and telephone antenna 6 constitute a mobile telephone set.
  • a connection unit 5 is affixed to, for example, an armrest provided in a passenger compartment and supplied with the source output S7 of 13.8 volts from a car battery 8.
  • the portable unit 7 is connected to the connection unit 5 and a switch 51 incorporated in the connection unit 5 is turned on, the mobile telephone set changes into a car telephone.
  • a car antenna 1 is mounted on, for example, the roof of the car while a power amplifier unit 3 is accommodated in, for example, the luggage compartment of the car.
  • An antenna cable 2 connects the car antenna 1 and power amplifier unit 3 to each other.
  • a flexible curled cord 4 connects the power amplifier unit 3 to the connection unit 5.
  • a transmit signal S3 to be transmitted as delivered from the antenna terminal 701 of the portable unit 7 to the telephone antenna 6.
  • the telephone antenna 6 converts the signal S3 to a first RF signal and then sends it to the base station of a mobile telephone system.
  • a second RF signal different in phase from the first RF signal is radiated from the base station.
  • the telephone antenna 6 converts the second RF signal to a received signal S11 and then applies it to the terminal 701.
  • the portable unit 7 generates the transmit signal S3 on the basis of a transmitter signal S20 fed from a transmitter S2 or generates a receiver signal S21 on the basis of the received signal S11 and feeds it to a receiver 83.
  • the portable unit 7 has a modulator (MOD) 74 which generates the transmit signal S3 in response to a carrier signal S14 and a modulating signal S15 fed thereto from a frequency synthesizer (SYNTH) 75 and a controller (CONT) 81, respectively.
  • the transmit signal S3 is applied to the antenna terminal 701 via a band pass filter 72 and one terminal of a switch 71 associated with the antenna 6.
  • the received signal S11 from the antenna terminal 701 is fed to an amplifier 77 via the terminal of the switch 71 and a band pass filter 73.
  • the band pass filters 72 and 73 constitute a duplexer for separating the signals S12 and S11 and are implemented as, for example, dielectric filters.
  • the amplifier 77 amplifies the signal S11 to produce an amplified signal S13 and then delivers the signal S13 to a receiving mixer 78 which may be implemented as a transistor mixer.
  • the receiving mixer 78 produces an IF signal S18 in response to the amplified signal S13 and a local oscillation signal S5 fed from a frequency synthesizer (SYNTH) 76,
  • the IF signal S18 is routed through one of input terminals of a switch 79 to a demodulator (DEM) 84.
  • the demodulator 84 amplifies the IF signal S18 to a predetermined level, produces a demodulated signal S22 including the signal S21 and control signal from the amplified signal S18, and then feeds the signal S22 to the controller 81.
  • the controller 81 outputs the modulating signal S15 based on the transmitter signal S20 from the transmitter 82 or outputs, on receiving the demodulated signal S22, the receiver signal S21 to be fed to the receiver 83. Further, the controller 81 controls the channels of the frequency synthesizers 75 and 76 by use of channel control signals S16 and S17 and controls the call connection between the portable unit 7 and the base station (originating and terminating call connection) by use of the modulating signal S15 and demodulated signal S22.
  • An operating section 80 has in input/output interface circuit for interfacing the portable unit 7 and the user of the telephone. The operating section 80 is connected to the controller 81 to interchange control signals S19 with the latter in the event of call processing or communication control.
  • the operating section 80 includes keys which may be operated by the user to enter control input signals, and a liquid crystal display (LCD) for displaying a telephone number of a desired remote station entered on the keys and various messages including the duration of a conversation.
  • a battery package (PS) 85 applies a source output S23 of 6 volts to the various sections of the portable unit 7.
  • a source output S7 i.e., a booster ON signal representative of the car-mounted mode is fed from the connection unit 5 to a booster ON signal receive terminal 705
  • the switch 71 of the portable unit 73 selects a booster signal terminal 702 so as to apply the transmit signal S3 from the band pass filter 72 to the terminal 702.
  • the source output S7 connects the input terminal of the switch 79 to an IF signal receive terminal 704, so that an IF signal from the terminal 704 may be routed to the demodulator 84.
  • the demodulator 84 demodulates the IF signal S6 to thereby produce a demodulated signal S22.
  • the local oscillation signal S5 is constantly fed to a local oscillation signal output terminal 703.
  • a transmit signal S2 to be transmitted is fed to the car antenna 1 by way of an antenna terminal 301 included in the power amplifier unit 3 and a coaxial cable (e.g. G55A/U) or similar antenna cable 2.
  • the car antenna 1 converts the transmit signal S2 to the previously mentioned first RF signal and sends it to the base station.
  • the car antenna 1 converts it to a received signal S1 and applies it to the antenna terminal 301.
  • the transmit signal S3 from the terminal 702 of the portable unit 7 is fed to a terminal 302 included in the power amplifier unit 3 via the connection unit 5 and curled cord 4.
  • the power amplifier unit 3 amplifies the signal S3 by a power amplifier 31 to thereby produce the transmit signal S2. Further, the power amplifier unit 3 effects low noise amplification with the received signal S1, mixes the resulting received signal S4 the local oscillation signal S5 fed thereto via the curled cord 4 and a local oscillation signal receive terminal 303, and then outputs the resulting IF signal S6 on an IF signal transmit terminal 304.
  • the IF signal S6 as routed through the connection unit 5 to an IF signal receive terminal 704 included in the portable unit 7.
  • the curled cord 4 as implemented as a single cable which as about 5 meters long and made up of coaxial cables 41, 42 and 43 for the propagation of high frequency signals and each corresponding to 1.5D-2W, a power line 44 for feeding the source output S7, and control lines, not shown, for allowing the power amplifier unit 3 and portable unit 7 to interchange control signals.
  • a connector may be affixed to both ends of the curled cord 4 to connect it to the power amplifier unit 3 and connection unit 5.
  • the connection unit 5 has a power supply (PS) 52 and a switch 51 for selectively connecting the source output S7 to a terminal 504.
  • the power supply 52 allows the source output S7 of 13.8 volts from the car battery 8 to pass therethrough and converts the source output S7 to a source output S8 of 6 volts.
  • the terminal 702 of the portable unit 7 is connected to the terminal 302 of the power amplifier unit 3 by the terminal 501 of the connection unit 5 and the coaxial cable 41 of the curled cord 4.
  • the terminals 703 and 502, coaxial cable 42 and terminal 303 are connected in series
  • the terminals 704 and 503, coaxial cable 43 and terminal 304 are connected in series
  • the terminals 705 and 504, power line 44 and terminal 305 are connected in series.
  • connection unit 5 includes a mechanism for removably connecting the portable unit 7 via the terminals 501-505 thereof and the terminals 702-706 of the portable unit 7.
  • the source output S7 is applied to both the power amplifier unit 3 and the portable unit 7.
  • the power source for the portable unit 7 is replaced with the source output S8 of 6 volts which is applied from the power supply 52 via the terminal 505 of the connection unit 5 and the terminal 706 of the portable unit 706.
  • the power amplifier 31 amplifies the transmit signal S3 come in through the terminal 302 to produce the transmit signal S2, the transmit signal S2 is fed to the terminal 301 via a band pass filter 32.
  • the received signal S1 from the terminal 301 is routed through a band pass filter 33 to a preamplifier 34.
  • the band pass filters 32 and 33 constitute a duplexer for separating the transmit signal S2 and the received signal S1.
  • the preamplifier 34 effects low noise amplification with the received signal S1 to produce a received signal S4.
  • a transistor mixer or similar receiving mixer 35 outputs an IF signal S6 in response to the received signal 54 and the local oscillation signal S5 from the terminal 303.
  • the IF signal S6 is delivered to the terminal 704 of the portable unit 7 via the terminal 304, coaxial cable 43, and the terminal 503 of the connection unit 5.
  • the source output S7 fed to the power amplifier unit 3 via the terminal 305 is applied to the power amplifier 31, preamplifier 34, and receiving mixer 35.
  • the coaxial cables implementing the cables 41, 42 and 43 of the curled cord 4 and corresponding to 1.5D-2W (RG-174/U) suffer from a loss of about 4.3 dB per 5 meters when the frequency is 850 MHz, but the loss is not more than about 1.2 dB per 5 meters when it comes to 90 MHz which as the frequency of the IF signal S6. It has been customary with a power amplifier unit to use a preamplifier (corresponding to preamplifier 34) having a high gain in order to compensate for the loss of received signals ascribable to the coaxial cables and the loss ascribable to duplexers preceding and following the preamplifier.
  • preamplifier corresponding to preamplifier 34
  • the coaxial cable 43 associated with the preamplifier 34 of the power amplifier unit 3 reduces the loss by about 3.1 dB, compared to the conventional power amplifier unit, and since the loss per duplexer is small, only the low noise characteristic can be pursued.
  • the receiving mixer 35 outputs an IF signal S6 of about 90 MHz on a terminal 314 thereof in response to the received signal S4 lying in the 800 MHz band and arrived at a terminal 311 and the local oscillation signal S5 fed to a terminal 312 via the local oscillation signal receive terminal 303. More specifically, the received signal S4 is applied to the base of a transistor 357 via a band pass filter 351 implemented by, for example, a coaxial type filter. The local oscillation signal S5 lower in frequency than the received signal S4 by about 90 MHz is also applied to the base of the transistor 357 via a band pass filter 352 and a capacitor 354.
  • the transistor 357 By mixing the signals S4 and S5, the transistor 357 produces the IF signal S6 on the terminal 314 which as connected to the collector thereof.
  • the transistor 357 is biased by the source output S7 of 13.8 volts applied to a terminal 313.
  • the terminal 313 is connected to the collector of the transistor 357 via a resonator made up of a capacitor 355 and an inductor 356 and is connected to the base of the transistor 357 via a resistor 353.
  • the emitter of the transistor 357 is connected to ground.
  • the receiving mixer 78 of the portable unit 7 also has a construction represented by the circuit diagram shown in FIG. 3, except for the following points. Since the prerequisite with the receiving mixer 78 is low power consumption, the source voltage of 6 volts is applied to the terminal 313. Another prerequisite with the receiving mixer 78 is small size. For this reason, the band pass filters 351 and 352, FIG. 3, are implemented by dielectric filters or SAW filters which are miniature, although the loss will slightly increase. Conversely, the receiving mixer 35 of the power amplifier unit 3 receives a high voltage and can operate with a large current and may be somewhat bulky. This is successful in reducing inter modulation and losses during the course of IF signal generation. Consequently, the car telephone can receive signals stably in the car-mounted mode operation.
  • FIG. 4 shows an alternative construction of the power amplifier unit.
  • the power amplifier unit generally 3A has a frequency synthesizer (SYNTH) 36 for feeding a local oscillation signal S31 to the receiving mixer 35, in addition to the constituent parts of the power amplifier unit 3, FIG. 1.
  • the frequency synthesizer 36 functions in the same manner as the frequency synthesizer 76 of the portable unit 7. Therefore, the frequency synthesizer 36 is controlled by the channel control signal S17 fed from the controller 81 of the portable unit 7 to a terminal 306 to a frequency corresponding to the control signal S17.
  • the control signal S17 is applied to the terminal 306 from the portable unit 7 by way of an extra coaxial cable included in the curled cord 4.
  • the power amplifier unit 3A reduces the loss of the local oscillation signal S5 ascribable to the curled cord 4 of the embodiment of FIG. 1 and reduces the power of the signal S5 to be generated by the frequency synthesizer 76 of the portable unit 7.
  • the receiving mixer 35 is incorporated in the power amplifier unit 3 (or 3A) for converting the received signal S4 undergone low noise amplification to the IF signal S6.
  • the IF signal S6 is transferred to the portable unit 7 over the coaxiable cable 43.
  • the embodiment therefore, reduces the signal loss ascribable to the duplexer of the portable unit and noticeably reduces the transmission on the coaxial cable 43. This eliminates the need for the compensation for the transmission loss ascribable to the various circuits of the power amplifier unit 3 and coaxial cable 43, whereby the gains and noise factors can be relatively freely allocated to the preamplifier 34, receiving mixer 35 and other circuits.
  • the embodiment reduces intermodulation distortions ascribable to the receiving mixer to thereby promote stable reception.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (8)

  1. Appareil téléphonique pour automobile, comprenant :
    un moyen récepteur à antenne portable (6) pour recevoir un signal radiofréquence afin de produire un premier signal reçu (S11) ;
    Un moyen à cordon (4) pour faire passer au moins un second signal reçu (S6) à travers lui ;
    une unité portable (7) ayant un émetteur, un récepteur et pouvant être connecté audit moyen à cordon (4) et audit moyen récepteur à antenne portable (6) pour appliquer sélectivement soit le dit premier, soit ledit second signal reçu audit récepteur ;
    un moyen à antenne monté dans l'automobile (1) pour recevoir un signal radiofréquence afin de produire un troisième signal reçu ;
    un moyen amplificateur (3) pour amplifier ledit troisième signal reçu afin de produire un signal amplifié ;
       un circuit oscillateur local (76, 36) ; et caractérisé par :
       un moyen pour mélanger en fréquence (35) ledit signal amplifié (S4) et le signal de sortie dudit circuit oscillateur local (76, 36) afin de produire et de transmettre un signal converti à fréquence diminuée (S6) audit moyen à cordon (4) en tant que ledit second signal reçu (S6) lorsque ladite unité portable (7) est couplée à la sortie dudit moyen de mélange en fréquence (35) via ledit moyen à cordon (4).
  2. Appareil téléphonique pour automobile selon la revendication 1, caractérisé en ce que :
    l'unité portable comprend un moyen pour convertir un signal radiofréquence (RF) reçu en provenance d'une station à distance en premier signal reçu tout en convertissant un premier signal de transmission devant être transmis à ladite station à distance en un signal RF en utilisant un signal provenant d'un autre circuit oscillateur local ;
    le moyen à antenne monté dans l'automobile (1) est connecté audit moyen amplificateur (3) qui comprend un moyen pour convertir ledit signal RF en le second signal reçu (S6) tout en convertissant un second signal de transmission (S3) devant être transmis à ladite station à distance en un signal RF ;
    un moyen à unité de connexion (5) est monté fixement sur ladite automobile pour connecter, de façon amovible, ladite unité portable ; et
    le moyen à cordon (4) connecte le moyen amplificateur et ledit moyen à unité de connexion ;
       ledit moyen récepteur portable comprenant ;
    un premier moyen synthétiseur de fréquence (75) sensible à un premier signal de commande de voie (S16) pour générer un signal porteur (S14) correspondant audit premier signal de commande de voie ;
    un moyen modulateur pour générer ledit premier signal de transmission en réponse à un signal de modulation (S15) et audit signal porteur ;
    une borne de réception de signal de suramplificateur EN CIRCUIT (705) pour recevoir un signal de sur amplificateur EN CIRCUIT (S7) représentatif d'un état EN CIRCUIT dudit moyen amplificateur (3) ;
    un premier moyen à commutateur (71) ayant une des deux bornes de sélection connectée audit moyen récepteur à antenne portable (6) et l'autre borne de sélection connectée à une borne de signal de suramplificateur (702) pour sélectionner ladite autre borne de sélection en réponse audit signal de suramplificateur EN CIRCUIT ;
    un premier moyen duplexeur (72, 73) ayant une borne de sortie de signal, une borne de signal d'entrée connecté audit moyen de modulation (74), et une borne d'entrée/sortie de signal connectée à une borne de sortie dudit premier moyen à commutateur (71) pour sélectionner ledit premier signal de transmission provenant dudit moyen de modulation (74) afin de délivrer ledit premier signal de transmission sur ladite borne d'entrée/sortie de signal ou de sélectionner ledit premier signal reçu provenant de ladite borne d'entrée/ sortie de signal pour délivrer ledit premier signal reçu sur ladite borne de sortie de signal.
    Un second moyen synthétiseur de fréquence (76) sensible à un second signal de commande de voie pour générer un premier signal d'oscillation locale correspondant audit second signal de commande de voie ;
    un premier moyen de mélange de fréquence reçue (78) pour générer un premier signal à fréquence intermédiaire (IF) (S18) en réponse audit premier signal d'oscillation locale (S5) et audit premier signal reçu (S11) provenant dudit moyen duplexeur ;
    un moyen de démodulation (84) pour produire un signal démodulé à partir dudit premier signal IF ;
    un moyen de commande (81) pour commander le traitement des appels et la communication entre ladite unité portable et la station à distance, ledit moyen de commande incluant un moyen pour générer un signal de récepteur (S21) à partir dudit signal démodulé, un moyen pour recevoir un signal d'émetteur (S20) devant être converti en ledit signal de modulation, et un moyen pour générer lesdits premier et second signaux de commande de voie ; et
    un moyen opératoire (80) incluant un moyen d'interface d'entrée/sortie pour mettre en interface ladite unité portable et un opérateur, et un moyen pour interchanger les signaux de commande avec ledit moyen de commande (81) au cours du traitement d'appel et de la commande de communication ;
       ledit moyen à unité de connexion (5) comprenant :
    un moyen (51, 52) de génération de signal de suramplificateur EN CIRCUIT (S7) pour générer ledit signal de suramplificateur EN CIRCUIT ; et
    une pluralité de bornes de connexion (702, 706) auxquelles les bornes de connexion de ladite unité portable incluant lesdites bornes de signal de suramplificateur et ladite borne de réception de signal de suramplificateur EN CIRCUIT sont connectées de façon amovible ;
    ledit moyen à cordon (4) comprenant des lignes de connexion (41, 42, 43) incluant un câble de transmission de signal à haute fréquence correspondant à celles respectives desdites bornes de connexion de ladite unité portable ;
       ledit moyen amplificateur (3) comprenant :
    un moyen amplificateur de puissance (31) pour générer ledit second signal de transmission en amplifiant ledit premier signal de transmission reçu à partir de ladite borne de signal de suramplificateur (702) via ledit moyen à unité de connexion (5) et ledit moyen à cordon (4) ;
    un second moyen duplexeur (32, 33) ayant une borne de sortie de signal, une borne d'entrée de signal (302) connectée audit moyen amplificateur de puissance (31), et une borne d'entrée/sortie de signal connectée audit moyen à antenne pour automobile (1) pour sélectionner ledit second signal de transmission provenant dudit moyen amplificateur de puissance afin de délivrer ledit second signal de transmission sur ladite borne d'entrée/sortie de signal (301) et sélectionner ledit second signal reçu provenant de ladite borne d'entrée/sortie de signal pour délivrer ledit second signal reçu sur ladite borne de sortie de signal ;
       ladite unité portable comprenant, en outre :
    une borne de réception de signal IF (704) pour recevoir un second signal IF ayant la même fréquence que ledit premier signal IF ; et
    un second moyen à commutateur (79) ayant une des deux bornes de sélection connectée à une borne de sortie dudit premier moyen de mélange de fréquence reçue (78) et l'autre borne de sélection connectée à ladite borne de réception de signal IF (704) pour sélectionner ladite autre borne de sélection en réponse audit signal de suramplificateur EN CIRCUIT ;
    ledit moyen de démodulation (84) étant connecté à une borne de sortie dudit second moyen à commutateur pour produire ledit signal démodulé (S22) à partir dudit second signal IF également ;
    dans lequel ledit moyen de mélange de fréquence (35) produit ledit second signal IF (S6) en réponse audit second signal reçu après amplification et un second signal d'oscillation locale (S5, S31) ayant la même fréquence que ledit premier signal d'oscillation locale (S5) ;
    ledit moyen à unité de connexion (5) et ledit moyen à cordon (4) transférant ledit second signal IF provenant dudit moyen à unité d'amplification de puissance (3) à ladite unité portable.
  3. Appareil téléphonique pour automobile selon la revendication 2, caractérisé en ce que ladite unité portable comprend, en outre, un moyen (6) pour transmettre ledit signal d'émetteur et le moyen pour recevoir ledit signal de récepteur.
  4. Appareil téléphonique pour automobile selon la revendication 2 ou 3, caractérisé en ce que ledit second signal d'oscillation locale est le même signal que ledit premier signal d'oscillation locale généré par ledit second moyen synthétiseur de fréquence ;
    ladite unité portable comprenant, en outre, une borne de sortie de signal d'oscillation locale (703) pour délivrer ledit premier signal d'oscillation locale ;
    ledit moyen à unité d'amplification de puissance (3) comprenant, en outre, une borne de réception de signal d'oscillation locale (303) pour recevoir ledit premier signal d'oscillation locale devant être transmis audit second moyen de mélange de fréquence reçue (35) ;
    ledit moyen à unité de connexion et ledit moyen à cordon (4) comprenant, en outre, un moyen (42, 502) pour transférer ledit premier signal d'oscillation locale provenant de ladite borne de sortie de signal d'oscillation locale à ladite borne de réception de signal d'oscillation locale.
  5. Appareil téléphonique pour automobile selon la revendication 4, caractérisé en ce que lesdits premier et second moyens de mélange de fréquence reçue (78, 35) comprennent chacun un mélangeur à transistors, ledit second moyen de mélange de fréquence reçue étant activé par une tension d'alimentation supérieure à une tension appliquée audit premier moyen de mélange de fréquence reçue.
  6. Appareil téléphonique pour automobile selon la revendication 4, caractérisé en ce que ladite unité portable comprend, en outre, une batterie d'alimentation (85) pour alimenter en énergie, dans ledit mode portable, ledit moyen constituant ladite unité portable ;
       ladite unité de connexion (5) comprenant, en outre ;
    un moyen à source d'alimentation (52) pour convertir la tension d'une batterie d'automobile (8) entre une tension égale à la tension de ladite batterie d'alimentation et transmettre la tension convertie à ladite unité portable ;
    un moyen pour générer ledit signal de suramplificateur EN CIRCUIT (S7) lorsque la connexion de ladite batterie d'automobile et l'une desdites lignes de connexion qui devrait être connectée à ladite borne de réception de signal de suramplificateur EN CIRCUIT sont amenées à un état de mise EN CIRCUIT ; et
    un moyen (51, 504, 44) pour transmettre la sortie de ladite batterie d'automobile audit moyen à unité d'amplification de puissance (3) en tant que source d'alimentation.
  7. Appareil téléphonique pour automobile selon la revendication 2 ou 3, caractérisé en ce que ladite unité portable comprend, en outre, une borne de sortie de signal de commande de voie pour délivrer ledit second signal de commande de voie (S17) ;
       ledit moyen à unité d'amplification de puissance (3) comprenant, en outre :
    une borne de réception de signal de commande de voie (306) pour recevoir ledit second signal de commande de voie ; et
    un troisième moyen synthétiseur de fréquence (36) sensible audit second signal de commande de voie (S17) pour générer ledit second signal d'oscillation locale en réponse audit second signal de commande de voie (S17) ;
    ledit second moyen à unité de connexion (5) et ledit moyen à cordon (4) comprenant, en outre, un moyen pour transférer ledit second signal de commande de voie de ladite borne de sortie de signal de commande de voie de ladite unité portable à ladite borne de réception de signal de commande de voie.
  8. Appareil téléphonique pour automobile selon la revendication 7, caractérisé en ce que lesdits premier et second moyens de mélange de fréquence reçue (78, 35) comprennent chacun un mélangeur à transistors, ledit second moyen mélangeur de fréquence reçue étant activé par une tension d'alimentation supérieure à une tension appliquée audit premier moyen de mélange de fréquence reçue.
EP92302689A 1991-03-27 1992-03-27 Amplificateur de puissance dans une automobile pour connexion enfichable avec un téléphone mobile Expired - Lifetime EP0506443B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9005291 1991-03-27
JP90052/91 1991-03-27

Publications (3)

Publication Number Publication Date
EP0506443A2 EP0506443A2 (fr) 1992-09-30
EP0506443A3 EP0506443A3 (en) 1992-12-23
EP0506443B1 true EP0506443B1 (fr) 1999-05-26

Family

ID=13987828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92302689A Expired - Lifetime EP0506443B1 (fr) 1991-03-27 1992-03-27 Amplificateur de puissance dans une automobile pour connexion enfichable avec un téléphone mobile

Country Status (5)

Country Link
US (1) US5369803A (fr)
EP (1) EP0506443B1 (fr)
AU (1) AU655243B2 (fr)
CA (1) CA2064129C (fr)
DE (1) DE69229246T2 (fr)

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JP2590007Y2 (ja) * 1992-05-01 1999-02-10 株式会社東芝 無線装置
JP2990992B2 (ja) * 1993-03-18 1999-12-13 三菱電機株式会社 衛星通信端末
JPH06276146A (ja) * 1993-03-19 1994-09-30 Fujitsu Ltd 移動電話装置
ES2102956B1 (es) * 1994-07-27 1998-04-01 Alcatel Standard Electrica Sistema de comunicaciones dual fijo-movil.
US5737687A (en) * 1995-03-01 1998-04-07 Qualcomm Incorporated Self-attenuating RF transceiver system using antenna and modem interfaces and cable link
US5640689A (en) * 1995-03-31 1997-06-17 Compaq Computer Corp. Communications apparatus with antenna switching based on antenna rotation
US5732335A (en) * 1995-04-28 1998-03-24 Telefonaktiebolaget Lm Ericsson Externally controlled output power by means of antenna keying
US5648712A (en) * 1995-08-29 1997-07-15 Asian Micro Sources, Inc. Universally interchangeable and modular power supply with integrated battery charger
US5807117A (en) * 1996-07-15 1998-09-15 Augat Inc. Printed circuit board to housing interconnect system
DE19708490A1 (de) * 1997-03-03 1998-09-10 Bosch Gmbh Robert Funkgerät
US6230031B1 (en) 1997-03-31 2001-05-08 Oki Telecom, Inc. Power amplifying circuitry for wireless radio transceivers
US6459915B2 (en) * 1997-09-02 2002-10-01 Matsushita Electric Industrial Co. Ltd. External adapter for a portable cellular phone
GB2331666A (en) * 1997-11-20 1999-05-26 Dsc Telecom Lp Subscriber Terminal for a Wireless Telecommunications System
US6480727B1 (en) 1999-01-12 2002-11-12 Tellabs Operations, Inc. Using inactivity levels to extend subscriber equipment battery life
US6957047B1 (en) 1999-02-18 2005-10-18 Ydi Wireless, Inc. Bi-directional switched RF amplifier, waterproof housing, electrostatic overvoltage protection device, and mounting bracket therefor
US6600929B1 (en) * 1999-04-02 2003-07-29 Qualcomm, Incorporated Power output control of a car kit by a coupled wireless device
US20030096588A1 (en) * 2001-11-20 2003-05-22 Vanderhelm Ronald J. Receiver intermod enhancer
US7010325B1 (en) 2002-06-11 2006-03-07 Sprint Spectrum L.P. Wireless repeater with wireless telephone adapter
US7024231B2 (en) * 2002-10-28 2006-04-04 Allen Cohen Booster system in a cellular phone base station
DE102023126409A1 (de) 2023-09-28 2025-04-03 Procertus Umwelttechnik GmbH Chemisch-energetischer Abluftwäscher

Citations (1)

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EP0486181A2 (fr) * 1990-11-16 1992-05-20 ORBITEL MOBILE COMMUNICATIONS LIMITED (Reg. no. 2515004) Téléphone radio-mobile

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JPH01220919A (ja) * 1988-02-29 1989-09-04 Toshiba Corp 無線電話装置
US5203020A (en) * 1988-06-14 1993-04-13 Kabushiki Kaisha Toshiba Method and apparatus for reducing power consumption in a radio telecommunication apparatus

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
EP0486181A2 (fr) * 1990-11-16 1992-05-20 ORBITEL MOBILE COMMUNICATIONS LIMITED (Reg. no. 2515004) Téléphone radio-mobile

Also Published As

Publication number Publication date
EP0506443A3 (en) 1992-12-23
AU1386692A (en) 1992-10-01
DE69229246T2 (de) 2000-02-10
CA2064129C (fr) 1997-03-04
US5369803A (en) 1994-11-29
EP0506443A2 (fr) 1992-09-30
AU655243B2 (en) 1994-12-08
CA2064129A1 (fr) 1992-09-28
DE69229246D1 (de) 1999-07-01

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